PMID- 29140117 OWN - NLM STAT- MEDLINE DCOM- 20181101 LR - 20181101 IS - 1546-3141 (Electronic) IS - 0361-803X (Linking) VI - 210 IP - 1 DP - 2018 Jan TI - Comparison of Radiation Dose and Image Quality of Abdominopelvic CT Using Iterative (AIDR 3D) and Conventional Reconstructions. PG - 127-133 LID - 10.2214/AJR.17.18025 [doi] AB - OBJECTIVE: The purpose of this study is to compare radiation dose and image quality of abdominopelvic CT studies reconstructed with iterative and conventional techniques. MATERIALS AND METHODS: This retrospective study enrolled 99 patients who underwent abdominopelvic CT examinations with the portal venous phase images reconstructed with both filtered back projection and Adaptive Iterative Dose Reduction 3D (AIDR 3D) at different time points. Subjective assessment of image quality was performed by two radiologists who scored axial images for overall quality, sharpness, noise, and acceptability in a blinded fashion. The SD of the mean attenuation of the liver, aorta, and paraspinal muscle (as a measurement of image noise) and contrast-to-noise and signal-to-noise ratios for liver and aorta were used as objective parameters of image quality. Radiation dose parameters included CT dose index volume (CTDI(vol)), dose-length product, effective dose (ED), and size-specific dose estimate (SSDE). Results were compared for different body mass index (BMI; weight in kilograms divided by the square of height in meters) categories. Paired t test and McNemar paired tests for noninferiority were used, with p < 0.05 considered statistically significant. RESULTS: We obtained a 62.5% mean reduction in CTDI(vol), a 58% mean reduction in ED, and a 63% mean reduction in SSDE when AIDR 3D was used (p < 0.001). Subjective parameters of image quality were considered noninferior for AIDR 3D studies compared with filtered back projection (p < 0.001), except for the sharpness of images of patients with BMI 20-24.9. Variable results were found regarding objective assessment of image quality. CONCLUSION: AIDR 3D allowed a significant reduction in radiation dose of abdominopelvic CT examinations without a loss of image quality in general. FAU - Mello-Amoedo, Caroline Duarte de AU - Mello-Amoedo CD AD - 1 Radiology and Diagnostic Imaging Department, Hospital Israelita Albert Einstein, 627 Albert Einstein Ave, Sao Paulo, SP 05651-901, Brasil. FAU - Martins, Aparecido Nakano AU - Martins AN AD - 1 Radiology and Diagnostic Imaging Department, Hospital Israelita Albert Einstein, 627 Albert Einstein Ave, Sao Paulo, SP 05651-901, Brasil. FAU - Tachibana, Adriano AU - Tachibana A AD - 1 Radiology and Diagnostic Imaging Department, Hospital Israelita Albert Einstein, 627 Albert Einstein Ave, Sao Paulo, SP 05651-901, Brasil. FAU - Pinho, Daniella Ferraro AU - Pinho DF AD - 2 Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX. FAU - Baroni, Ronaldo Hueb AU - Baroni RH AD - 1 Radiology and Diagnostic Imaging Department, Hospital Israelita Albert Einstein, 627 Albert Einstein Ave, Sao Paulo, SP 05651-901, Brasil. LA - eng PT - Comparative Study PT - Journal Article DEP - 20171115 PL - United States TA - AJR Am J Roentgenol JT - AJR. American journal of roentgenology JID - 7708173 SB - IM MH - Abdomen/*diagnostic imaging MH - Adult MH - Aged MH - Aged, 80 and over MH - Female MH - Humans MH - *Imaging, Three-Dimensional MH - Male MH - Middle Aged MH - Pelvis/*diagnostic imaging MH - *Radiation Dosage MH - Reproducibility of Results MH - Retrospective Studies MH - Signal-To-Noise Ratio MH - *Tomography, X-Ray Computed MH - Young Adult OTO - NOTNLM OT - CT OT - adaptive iterative dose reduction 3D OT - iterative reconstruction OT - radiation dose reduction EDAT- 2017/11/16 06:00 MHDA- 2018/11/02 06:00 CRDT- 2017/11/16 06:00 PHST- 2017/11/16 06:00 [pubmed] PHST- 2018/11/02 06:00 [medline] PHST- 2017/11/16 06:00 [entrez] AID - 10.2214/AJR.17.18025 [doi] PST - ppublish SO - AJR Am J Roentgenol. 2018 Jan;210(1):127-133. doi: 10.2214/AJR.17.18025. Epub 2017 Nov 15.